In our fourth evaluation, we analyzed the disk I/O for each of the workloads.
在第四个评估场景中，我们分析了不同工作负载下的磁盘输入/输出。
Most often, you want only a small subset of the data in the table, so a full table scan wastes a lot of disk I/O and therefore time.
通常来说，您可能只希望获得表中数据的一个子集，因此全表扫描会浪费大量的磁盘I/O，因此也就会浪费大量时间。
Just as before, if I need to reboot the LPAR at this point, I can rest assured that I can boot from either disk.
与以前一样，如果我需要在此刻重新引导这个LPAR，我将有把握能够从任一磁盘引导。
To ensure that the boot disk and boot list had been configured correctly, I would reboot the system to verify.
为了确保引导磁盘和引导列表已被正确配置，我将重新引导系统以便验证。
Part 3 of this series focuses on the application layer as you move on to file systems, using various commands to monitor and tune your file systems and disk I/O subsystems.
本系列文章的第 3部分将在您继续研究文件系统的同时，重点关注于应用程序层，并使用各种命令以监视和优化您的文件系统和磁盘I/O 子系统。
Unlike the tuning of other subsystems, tuning disk I/O should actually be started during the architectural phase of building your systems.
与其他子系统的优化工作不同，实际上在构建系统的体系结构设计阶段就应该开始进行磁盘I/O 优化。
The hit ratios for data and index pages reflect the number of times a page request was handled by the buffer pool directly without requiring disk I/O.
数据和索引页面的击中率反映了缓冲池在不需要磁盘I/O的情况下直接处理一个页面请求的时间量。
Transactions requiring disk I/O, such as flushing dirty pages from the buffer pool or flushing logs from the log buffer, may wait.
要求磁盘I/O 的事务，例如刷新缓冲池中的脏页或者刷新日志缓冲区中的日志，可能需要等待。
I only have limited disk space, so I wrote a tile server in C++ that would generate tile files on demand, and then cache them.
我的硬盘空间不够用，因此我用C++写了一个贴图服务，可以根据需要生成并存储贴图文件。
If booting from disk had been unsuccessful, for whatever reason, I would have instigated Plan b.
如果由于某种原因从磁盘引导不成功，我就采用备用计划。
I confirmed that the new disk was discovered and the paths had been configured correctly.
我还确认这个新磁盘已被发现且路径已被正确配置。
I use two main areas to categorize disk errors on AIX systems: impact and duration.
我使用两个主要的度量值来分类AIX系统上的磁盘错误：影响和持续时间。
We are more proficient in analyzing the amount of the processor used and the amount of memory used, and we are now focusing more on the amount of disk I/O used (performance and configuration).
我们已经可以更加专业地分析处理器使用量和内存使用量，现在我们更多地关注磁盘I/O 使用量（性能和配置）。
The reduction in disk I/O reduces execution time.
磁盘I/O 的减少也减少了执行时间。
The additional network hop and disk I/O is adding significant time to the transactions.
在执行过程中，网络跳转与磁盘I/O操作耗费了大多数时间。
With the operating system now residing on the new disk, I focused on migrating the data volume groups.
当操作系统现迁移到新磁盘之后，我重点进行数据卷组迁移。
If I needed to restart the system at this point in the migration, I could be assured that I could boot from either disk.
如果在迁移的这个时候需要重启系统，我就能有把握能从任一磁盘引导。
The reason for this is to limit the amount of dirty pages in memory, which further reduces I/O overhead and disk fragmentation.
这么做可以限制内存中 “脏”页面的数量，从而进一步减少I/O开销和磁盘碎片。
There are many other areas of investigation, for example, hardware, disk I/O, configuration, topology, tuning parameters, OS, and patches, among others.
还需要调查其他很多方面，比如硬件、磁盘I/O、配置、拓扑、调优参数、OS和补丁等。
Some of the test types require less CPU and disk space, whereas some of the test types requires high CPU usage, I/O operations, and disk usage.
一些测试类型需要较少的CPU和磁盘空间，而另一些测试类型需要较高的 CPU使用率、I/O操作和磁盘使用率。
So, if hit ratios are low, a significant amount of disk I/O is taking place.
所以，如果击中率较低，表明正在发生大量的磁盘I/O。
To access my photos, I mount the drive and copy the image files onto my hard disk.
为了访问我的相片我先挂载驱动然后拷贝图片文件到我的硬盘中。
How could I recover a server from a disk that could not be deconfigured or have the data from a failed physical partition moved off of it?
如何从无法撤销配置的磁盘恢复服务器，或者取出无法移出这个磁盘的物理分区中的数据？
The function of AIO is to perform disk I/O when SQL statement accessing or updating database data.
AIO的功能是在SQL语句访问或更新数据库数据时，执行磁盘I/O。
Fortunately, I could transfer my data easily since I always backup my data to an external disk.
幸好，我可以轻松的传送数据过去，因为总有在移动硬盘上备份的习惯。
Recently when I filled my disk drive I realized that I could pay the same amount per month but upgrade to a server with twice the RAM and more than twice the amount of disk space.
最近我填充我的硬盘，我突然意识到，我能够每月付同样的钱，可是把服务器的RAM扩大一倍，把硬盘空间扩大到两倍以上。
I regularly defragment the hard disk, tweak the registry, and clean out temporary files, but my PC is still slow.
我会定期整理磁盘碎片、打扫注册表，清理临时文件，但我的电脑仍然很慢。
Suppose we have a rotating disk, and I will make you see the disk now with depth.
假设有个转动圆盘，现在给你们看它有厚度的。
The closer the ratio is to 100 percent, the lower the frequency of disk I/O, and therefore the less overhead of reading data.
命中率越接近 100%，磁盘I/O的频率就越低，因而读取数据的开销就越少。
This reduces the disk I/O and significantly improves the performance and throughput.
这会减少磁盘I/O并显著提升性能和吞吐量。
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